Hardware: Macbook5,1 (Aluminum) Intel Core 2 Duo, 2.4 ghz, 4gb Ram
Software: Mac OSX Snow Leopard 10.6.1

I will appreciate if someone could help me with an issue that I have with my Macbook. I have posted this in Apple Discussions, and is still without a fix:

When I am working on my computer, and I close my lid, when I open it again, it seems to have logged me out, and all of the apps have been closed, etc.. It does the process of login in again, mounting disks, initiating login items, etc.

is this a known bug? what is the fix for this? I already did a PRAM reset, and the issue keeps happening..

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the logout after x number of minutes is not enabled, therefore that can’t be the issue..

If I run repair disk permissions, I get the following:

Repairing permissions for “Macintosh HD”
Warning: SUID file “System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/MacOS/ARDAgent” has been modified and will not be repaired.
Warning: SUID file “System/Library/PrivateFrameworks/DesktopServicesPriv.framework/Versions/A/Resources/Locum” has been modified and will not be repaired.

Permissions repair complete

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Any help, guesses, suggestions is highly appreciated…

Thanks,